While I know you are correct chronologically, it is 2020 now I think ‘network effects’ have come to dominate this perception (that Haskell is the language that gives the basis for breaking away from “practical languages). I think Haskell’s presence in the group consciousness of CS-minded developers is, at this point, due to the comparatively large web presence and semi-PR done on its behalf. Simon Peyton Jones almost single handedly pumps Haskell (and I love him for it) more than anyone pushes ADA, SML, and Modula put together.